r850r Tranny Bump

[rivercruz]

Greetings

I'm the (otherwise) pleased new owner of a 96 r850r with under 12k miles.

Thought I was nuts when I noticed the bike seemingly popping out of gear under moderate-to-hard load in 2nd gear only; the best way to describe the experience was as if I drove over a good sized rock, and broke the rear wheel loose. Only no bump 'cause there was no rock, and it didn't break loose. Did a little web searching and found postings such as the following dating back to 1997.

http://www.slack.net/~thundt/Bmw/transmis.txt

Does anybody know

1. Did BMW ever issue a service bulletin for this 'tranny bump'? Looks like they replaced a bunch of tranmissions in the late 90's. Seems like this is a design flaw that should have been addressed, but of course any warranty would have expired long ago.

2. If I leave things alone and don't pound on the bike at low speeds, is the problem likely to get worse anyway?

Answers/suggestions to these questions, or any other relevant experience or information would be much appreciated.

rich mayo

[dbrick]

[QUOTE]Originally posted by rivercruz

> 1. Did BMW ever issue a service bulletin for this 'tranny bump'? Looks like > they replaced a bunch of tranmissions in the late 90's. Seems like this is a > design flaw that should have been addressed, but of course any warranty > would have expired long ago.

I don't know. I never heard of service bulletins on this issue.

> 2. If I leave things alone and don't pound on the bike at low speeds, is the > problem likely to get worse anyway?

Probably...and it assuredly won't get any better.

I had this at 12K on my 96 R11RS. The transmission was replaced under warranty, and has been fine since (now at 68K).

I think Paul Glaves' assessment (that this condition is caused by a too-weak torque compensator spring) is correct.

[KBasa]

Hi Dave!

:wave

[jdiaz]

Have your dealer do a search on this VIN. A lot of '96 models got new trannies do to an assembly issue that caused some oil leaks, so its likely that your bike already has a replacement transmission.

[boxer259]

My 97 850 with 20.000 does it also.If you bring it to your dealer
and tell them about it as it's being serviced,they'll fix it,but it will
return again.